Thursday, March 27, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, MARCH 27, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0535E
SUNSET: 1805E
COLD AND SUNNY START TO THE DAY, BECOMING MOSTLY CLOUDY BY AFTERNOON….
We had a brilliant albeit cold start to the day with clear skies
and plenty of bright sunshine. However, as the diurnal heating
took place during the morning hours, stratocumulus clouds began
to develop and rapidly increase in coverage. The sky now features
more clouds than sun as we push through the early afternoon hours.
Temperatures started on the cold side, with readings dropping to
the mid 20s here on the summit. They quickly rebounded however once
the sun came up and did its work. Values have reached the mid 40s
by early this afternoon. Dew point values however are once again
holding in the 20s, thus adding a decided chill to the air, especially
with the brisk wind.
Winds were fairly steady around 10mph early this morning, but have
been increasing a bit as the atmosphere began mixing by mid morning.
The average speed for the day so far is around 11mph, mainly out of
the west-northwest. The peak gust so far is 28mph, which occurred
at 11:15am this morning.
Visibility has been fairly excellent all day, starting the day
around 60 miles, and then improving to around 80 miles by early
this afternoon.
The maximum temperature for today is 46F degrees, which is 2 degrees
below the normal high of 48F. The minimum temperature since midnight
is 27F degrees, which is 3 degrees below the normal low of 30F.
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Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus distant W, few altocumulus/castellanus
distant WNW-N and distant NE-SE
Temperature: 31F; Dew Point: 22F; Relative Humidity: 69%
Wind: WNW @ 10 kts
Sea-level pressure: 1019.6 mb; 30.11 in. Hg: rising, then more rapidly
Visibility: 60 miles
6-hr Max temp: 34F
6-hr Min temp: 27F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 60 196/31/22/2910/011/ FEW SC DSNT W FEW AC/ACC DSNT
WNW-N AND DSNT NE-SE/ 8/580 53015 10034 20027
10 A.M.
Weather: Broken stratocumulus, broken altocumulus/castellanus
Temperature: 41F; Dew Point: 25F; Relative Humidity: 51%
Wind: WNW @ 14G23 kts
Sea-level pressure: 1020.1 mb; 30.12 in. Hg: rising, then more slowly
Visibility: 70 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E50 BKN 100 BKN 70 201/41/25/3014G23/012/ 8/580 51005
1 P.M.
Weather: Broken stratocumulus, virga distant NE-E and distant SE-SW
Temperature: 44F; Dew Point: 23F; Relative Humidity: 42%
Wind: NW @ 11G20 kts
Sea-level pressure: 1019.4 mb; 30.10 in. Hg: falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 46F
6-hr Min temp: 31F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E60 BKN 80 194/44/23/3111G20/010/ VIRGA DSNT NE-S AND DSNT
SE-SW/ 8/500 58007 10046 20031
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SUMMARY FOR WEDNESDAY, MARCH 26, 2025
TEMPERATURE (DEGREES F)
MAX…….51 NORMAL…..47
MIN…….36 NORMAL…..30
MEAN……44 NORMAL…..39
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+5
TOTAL DEPARTURE FOR THE MONTH……………………+153 [+5.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….21 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH……………633 DEPARTURE……-155
TOTAL HEATING UNITS FOR THE SEASON………….4814 DEPARTURE……-406
TOTAL HEATING UNITS LAST SEASON TO DATE……..4543 DEPARTURE……+271
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated
F420C (Official)………..25 WNW @ 10:18 P.M.
VECTOR #1 (1-Sec)……….25 NW @ 10:19 P.M.
VECTOR #2 (1-Sec)……….26 NW @ 10:37 P.M.
DAVIS #1……………….24 NW @ 10:19 P.M.
DAVIS #2 ………………22 NW @ 10:04 P.M.
RMY #1 (Instantaneous)…..27 NW @ 10:19 P.M.
RMY #2 (Instantaneous)…..25 NW @ 11:36 P.M.
MERLIN…………………26 NW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 WNW @ 10:18 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 @ 10:20 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 10:06 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 WNW @ 10:21 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 NW @ 11:37 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 WNW @ 10:21 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 WNW @ 10:06 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………6.0 NNW [145 total miles]
VECTOR #1……………….6.6
VECTOR #2……………….6.9
DAVIS #1………………..6.3 NW
DAVIS #2………………..6.3 NNW
RMY #1………………….6.4 NW
RMY #2………………….6.8 NW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..4.53 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE YEAR (2025)…….10.18 DEPARTURE…..-2.97
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.4
TOTAL SNOWFALL FOR THE MONTH………………TRACE DEPARTURE…..-13.6
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……34.1 DEPARTURE…..-31.4
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PRELIMINARY CLIMATE SUMMARY FOR MARCH CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY: R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
3/1 50/21/36/+5/T/T/081/12 46 NW VEC1 46 NW RMY 49
3/2 28/14/21/-11/0.00/0.0/672/99 41 NW VEC1 42 NW RMY 43
3/3 31/8/20/-12/0.00/0.0/667/98 28 NW VEC1 28 NW RMY 31
3/4 48/23/36/+4/0.00/0.0/390/57 41 SW VEC1 42 SW RMY 43
3/5 54/41/48/+16/0.52/0.0/021/03 50 SSW VEC1 50 SSW RMY 55
3/6 55/32/44/+11/0.66/T/014/02 69 S VEC1 69 S RMY 68
3/7 41/25/33/0/T/T/638/92 60 WNW VEC1 61 WNW RMY 64
3/8 40/27/34/+1/0.00/0.0/619/89 55 W VEC1 55 W RMY 58
3/9 45/25/35/+2/0.00/0.0/544/78 40 W VEC1 39 W RMY 42
3/10 60/33/47/+13/0.00/0.0/680/97 38 WNW VEC1 38 WNW RMY 39
3/11 62/37/50/+16/0.00/0.0/676/96 39 SSW VEC1 40 SSW RMY 40
3/12 48/32/40/+6/T/T/544/77 29 N VEC1 29 N RMY 29
3/13 46/32/39/+5/0.00/0.0/483/68 25 ESE VEC1 26 ESE RMY 25
3/14 54/33/44/+9/0.00/0.0/570/80 22 SSW VEC1 22 SSW RMY 22
3/15 59/37/48/+13/0.00/0.0/358/50 28 S VEC1 28 S RMY 28
3/16 67/44/56/+21/0.05/0.0/136/19 56 SSW VEC1 58 SSW RMY 58
3/17 58/38/48/+12/2.12/0.0/000/00 60 SSW VEC1 60 SSW RMY 60
3/18 48/34/41/+5/0.00/0.0/362/50 31 NNW VEC1 31 NNW RMY 32
3/19 52/34/43/+7/0.00/0.0/662/91 18 NE VEC1 18 NE RMY 17
3/20 55/36/46/+9/0.03/0.0/044/06 30 S VEC1 30 S RMY 30
3/21 46/36/41/+4/0.36/0.0/220/30 48 NW VEC1 49 NW RMY 54
3/22 62/33/48/+11/T/0.0/545/74 53 WNW VEC1 52 WNW RMY 58
3/23 44/25/35/-3/0.00/0.0/694/94 39 WNW VEC1 39 NW RMY 40
3/24 43/31/37/-1/0.79/0.0/000/00 35 S VEC1 35 S RMY 36
3/25 53/33/43/+5/0.00/0.0/558/75 32 WSW VEC1 33 WSW RMY 34
3/26 51/36/44/+5/0.00/0.0/217/29 25 WNW VEC1 25 NW RMY 27
3/27 The low since midnight is 27F, the daily normal low is 30F.
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MARCH DAILY RECORDS TO DATE
3/16 RECORD HIGH MINIMUM TEMP OF 44F;
OLD RECORD WAS 43F IN 1921, 1973
3/17 RECORD PRECIPITATION AMOUNT OF 2.12 INS;
OLD RECORD WAS 1.97 INS IN 1968
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR MARCH 27
HIGH 78 IN 1998
LOW 12 IN 1975
PRECIP 1.05 INS. IN 1913
SNOWFALL 6.6 INS. IN 1959
PEAK GUST 62 MPH NW IN 1965, SE IN 1992
RECORDS FOR MARCH 28
HIGH 86 IN 1998
LOW 7 IN 1923
PRECIP 2.31 INS. IN 1932
SNOWFALL 5.0 INS. IN 2015
PEAK GUST 60e MPH NW IN 1944, 60 WSW IN 1991
TODAY’S REPORT PREPARED BY: Matt Douglas
